PLACE potatoes in microwaveable dish; cover. Microwave on HIGH 15 min. or until tender.
MEANWHILE, heat oil in large nonstick skillet on medium-high heat. Add chicken and onions; cook 10 min. or until chicken is browned on both sides, turning chicken over after 5 min. and stirring onions occasionally.
ADD potatoes, peas, broth, barbecue sauce and dressing; mix well. Cover. Reduce heat to medium-low; simmer 5 min. or until chicken is cooked through (170°F).
